This resource offers various spaceships, some that are departing and designed to move away from the camera. Some convoys are designated as approaching, and as the name implies, this means that the ships start out at a large distance in front of the camera and move towards the viewer. The ships travel in random strings as particle effects. Since these are particles, they have reduced impact on performance. A demo scene is provided in order to get an idea of how to arrange these particle effects in a scene.
Credits to Hazmhox for the Spacebox asset which helps make for a nice demo scene.
Credits to Hazmhox for the Spacebox asset which helps make for a nice demo scene.